Display device and method of controlling display device

• US 8,421,813 B2
• Filed: 12/16/2009
• Issued: 04/16/2013
• Est. Priority Date: 12/19/2008
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Takase, Hiroshi
• Primary Examiner(s): Sajous, Wesner
• Application Number:
  US12/639,499
• Publication Number:
  US 20100156927A1
• Time in Patent Office: 1,217 Days
• Field of Search: 345/426, 345/581, 345589-591, 345/597, 345600-601, 345/606, 345611-613, 345617-618, 345/549, 345/207, 345/690, 345 48- 50, 345/63, 345 76- 77, 345/84, 345 87- 89, 345/903, 348179-180, 348/254, 348/383, 348/560, 348/571, 348602-603, 348/612, 348/655, 348/687, 348/708, 348/724, 348/739, 348759-761, 358/509, 358/516, 358518-520, 358523-525, 358447-448, 382/162, 382/167, 382/254, 382/274, 382/276, 382/312, 359/227, 359/237, 359/242, 359/389, 359/395, 359/642
• US Class Current: 345/589
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources

Abstract

A display device includes a light modulating unit configured to modulate light based on a video signal, a light source configured to supply light to the light modulating unit, a detecting unit configured to detect a light amount of the light source, and a control unit configured to perform control for correcting the video signal based on the detected light amount so as to attain a color temperature and brightness that had already been set.

Claims

1. A display device comprising:

a light modulating unit configured to modulate light based on a video signal;

a light source configured to supply light to the light modulating unit such that the supplied light is modulated based on said video signal;

a detecting unit configured to detect a light amount emitted by the light source; and

a control unit configured to calculate chromaticity information and brightness information based on the detected light amount and to perform control for correcting the video signal based on the calculated chromaticity and brightness information so as to attain a color temperature and brightness that had already been set for the light supplied by the light source.

2. The display device according to claim 1, wherein the detecting unit detects the light amount for each of red (R), green (G), and blue (B);

and

wherein the control unit calculates an adjusted value of each of the R, the G, and the B of the video signal based on the detected light amount of each of the R, the G, and the B so that the color temperature and the brightness that had already been set are attained, and performs control so as to correct the video signal based on the adjusted value.

3. The display device according to claim 2,

wherein the control unit includes:

a conversion unit configured to convert the detected light amount of each of the R, the G, and the B into chromaticity information and brightness information; and

a calculating unit configured to calculate the adjusted value of each of the R, the G, and the B based on the converted chromaticity information and the converted brightness information of each of the R, the G, and the B so as to attain the color temperature and the brightness that had already been set.

6. The display device according to claim 1, wherein the chromaticity of the light source is changed due to a variation in brightness.

7. The display device according to claim 6, wherein the light source is a cold cathode fluorescent lamp.

8. The display device according to claim 1, wherein the light modulating unit modulates light through liquid crystal.

4. A display device comprising:

a light modulating unit configured to modulate light based on a video signal;

a light source configured to supply light to the light modulating unit;

a detecting unit configured to detect a light amount of the light source; and

a control unit configured to perform control for correcting the video signal based on the detected light amount so as to attain a color temperature and brightness that had already been set,

wherein the control unit includes;

a brightness correction value-calculating unit configured to calculate a brightness correction value based on a difference between a variation in brightness for output video data, the variation occurring due to a video signal obtained after the video signal correction is performed, and the brightness that had already been set; and

a light source brightness-control unit configured to control brightness of the light source based on the brightness correction value calculated through the brightness correction value-calculating unit.

5. The display device according to claim 4, wherein the detecting unit detects the light amount of the light source controlled by the light source brightness-control unit, and the detected light amount is fed back to the control unit.

9. A method of controlling a display device, the method comprising the steps of:

detecting an amount of light supplied from a light source when the supplied light is modulated for display based on a video signal; and

calculating chromaticity information and brightness information based on the detected light amount and performing control to correct the video signal based on the calculated chromaticity and brightness information so as to attain a color temperature and brightness that had already been set for the light supplied by the light source.